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#include "pch.h"
#include "Utils.h"
bool Utils::Detour32(char* src, char* dst, const intptr_t len)
{
if (len < 5) return false;
DWORD curProtection;
VirtualProtect(src, len, PAGE_EXECUTE_READWRITE, &curProtection);
intptr_t relativeAddress = (intptr_t)(dst - (intptr_t)src) - 5;
*src = (char)'\xE9';
*(intptr_t*)((intptr_t)src + 1) = relativeAddress;
VirtualProtect(src, len, curProtection, &curProtection);
return true;
}
char* Utils::TrampHook32(char* src, char* dst, const intptr_t len)
{
// Make sure the length is greater than 5
if (len < 5) return 0;
// Create the gateway (len + 5 for the overwritten bytes + the jmp)
void* gateway = VirtualAlloc(0, len + 5, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE);
if (gateway == NULL) return 0;
// Write the stolen bytes into the gateway
memcpy(gateway, src, len);
// Get the gateway to destination addy
intptr_t gatewayRelativeAddr = ((intptr_t)src - (intptr_t)gateway) - 5;
// Add the jmp opcode to the end of the gateway
*(char*)((intptr_t)gateway + len) = 0xE9;
// Add the address to the jmp
*(intptr_t*)((intptr_t)gateway + len + 1) = gatewayRelativeAddr;
// Perform the detour
Detour32(src, dst, len);
return (char*)gateway;
}
int spotifyVer = -1;
int Utils::GetSpotifyVersion()
{
if (spotifyVer != -1)
return spotifyVer;
LPCWSTR lpszFilePath = L"Spotify.exe";
DWORD dwDummy;
DWORD dwFVISize = GetFileVersionInfoSize(lpszFilePath, &dwDummy);
LPBYTE lpVersionInfo = new BYTE[dwFVISize];
GetFileVersionInfo(lpszFilePath, 0, dwFVISize, lpVersionInfo);
UINT uLen;
VS_FIXEDFILEINFO* lpFfi;
VerQueryValue(lpVersionInfo, _T("\\"), (LPVOID*)&lpFfi, &uLen);
DWORD dwFileVersionMS = lpFfi->dwFileVersionMS;
DWORD dwFileVersionLS = lpFfi->dwFileVersionLS;
delete[] lpVersionInfo;
DWORD dwLeftMost = HIWORD(dwFileVersionMS);
DWORD dwSecondLeft = LOWORD(dwFileVersionMS);
DWORD dwSecondRight = HIWORD(dwFileVersionLS);
DWORD dwRightMost = LOWORD(dwFileVersionLS);
return spotifyVer = dwSecondRight;
}
std::string Utils::HexString(BYTE* data, int len)
{
std::stringstream ss;
ss << std::hex;
for (int i(0); i < len; ++i)
ss << std::setw(2) << std::setfill('0') << (int)data[i];
return ss.str();
}